Fault: The Unit Will Not Start; Fault: The Unit Starts, But The Motor Protection Switch Triggers Shortly After Start-Up; Fault: Unit Runs But Does Not Pump; Fault: The Unit Runs, But Not Within Stated Operat- Ing Parameters - Wilo Drain MTC 32 Notice De Montage Et De Mise En Service

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9.1. Fault: The unit will not start

1. Electricity supply interrupted, short circuit or
earth fault in the cable or motor windings
• Have the motor and wires checked by a special-
ist and replaced if necessary
2. Fuses, the motor protection switch and/or moni-
toring devices are triggered
• Have a specialist inspect the connections and
correct them as necessary.
• Have the motor protection switches and fuses
installed or adjusted according to the technical
specifications, and reset monitoring equip-
ment.
• Check that the impeller runs smoothly. Clean or
free it as necessary
3. The moisture sensors (optional) have interrupted
the power circuit (operator-related)
• See fault: Mechanical shaft seal leak, moisture
sensors report a fault or shut down the unit
9.2. Fault: The unit starts, but the motor protection
switch triggers shortly after start-up
1. The thermal trigger on the motor protection
switch is incorrectly set
• Have a specialist compare the setting of the
trigger with the technical specifications and
correct if necessary
2. Increased power consumption due to major volt-
age drop
• Have an electrician check the voltage on each
phase and rewire if necessary
3. Two-phase operation
• Have a specialist inspect the connection and
correct it as necessary
4. Excessive voltage differences on the three phases
• Have a specialist inspect the connection and
the switching system and correct it as neces-
sary
5. Incorrect direction of rotation
• Swap the 2 phases from the mains supply
6. Impeller impeded by adhesive material, blockages
and/or solid matter, increased current consump-
tion
• Switch off the unit, secure it against being
switched on again and free the impeller or clean
the intake port
7. The pumped liquid is too dense
• Contact the manufacturer

9.3. Fault: Unit runs but does not pump

1. No pumped liquid
• Open the container intake or sliders
2. Intake blocked
• Clean the intake, slider, intake port or intake
strainer
3. Impeller blocked or obstructed
• Switch off the unit, secure it against being
switched on again and free the impeller
4. Defective hose or pipeline
• Replace defective parts
5. Intermittent operation
• Check the control panel
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TROUBLESHOOTING AND POSSIBLE SOLUTIONS
9.4. Fault: The unit runs, but not within stated oper-
ating parameters
1. Intake blocked
• Clean the intake, slider, intake port or intake
strainer
2. Valve in the discharge pipe closed
• Fully open the valve
3. Impeller blocked or obstructed
• Switch off the unit, secure it against being
switched on again and free the impeller
4. Incorrect direction of rotation
• Replace two phases on the mains supply
5. Air in the system
• Check the pipelines, pressure shroud and/or
hydraulics, and bleed if necessary
6. Unit is pumping against excessive pressure
• Check the valve in the discharge pipe and open
it completely if necessary, use a different im-
peller or contact the factory
7. Signs of wear
• Replace worn parts
8. Defective hose or pipeline
• Replace defective parts
9. Inadmissible levels of gas in the pumped liquid
• Contact the manufacturer
10. Two-phase operation
• Have a specialist inspect the connection and
correct it as necessary
11. Excessive decrease in the water table during
operation
• Check the supply and capacity of the system,
and inspect the level control settings and
functionality
9.5. Fault: The unit does not run smoothly and is
noisy
1. Unit is operating in an inadmissible range
• Check the operational data of the unit and
correct if necessary, and/or adjust the operating
conditions
2. The intake port, strainer and/or impeller is
blocked
• Clean the intake port, strainer and/or impeller
3. The impeller is obstructed
• Switch off the unit, secure it against being
switched on again and free the impeller
4. Inadmissible levels of gas in the pumped liquid
• Contact the manufacturer
5. Two-phase operation
• Have a specialist inspect the connection and
correct it as necessary
6. Incorrect direction of rotation
• Replace two phases on the mains supply
7. Signs of wear
• Replace worn parts
8. Defective motor bearing
• Contact the manufacturer
9. The unit is installed under mechanical strain
• Check the installation, use rubber spacers if
necessary
WILO SE 2016-07 V4.0 DIN A4